Self opening die-head



July 12, R M STRICKLAND SELF OPENING DIE HEAD Filed May 28, 1931 3sheeheet i 1 n 553153 annum l 1 23 YW w! ZZ 65 V 5 2f July 12, 1932- R,M. STRIGKLAND 1,867,192

SELF' OPENING DIE HEAD VFiled May 28, 1931 5 Sheets-Sheet 2 l 35#56?65'46 67 22 5f 7 N w'l//f////l//M j ff July 12, 1932- R. M.STRICKLAND 1,867,192

SELF OPENING DIE HEAD Filed Ma 28, 1951 3 Sheets-Sheet 3 35N 25J/f@ y? y@f 7 27 a v "w, A

Patented July 12,v 1931?..

Umrs'nfsrares PATENT. @ma

Royen M. s'rnrcxrannor New HAVEN, coNNEcrIeuT', Assrsnon 'ro THE GEoMETnIC. l Toor. confrannfor nn'w HAVEN, oonnno'rrcur, A CORPQRATION'sans OPENING v:DIEQHEAD' Appiicatioa sied Mayas, 1931. serial No.540,542.- 1

This invention relates to improvement in self-opening die-heads andparticularly to that type of die-heads commonly referred to as pullbldie-heads and provided with a Chaser-carrier slidably mounted withrespect to certain features of theA die-head, so that al forward draftexerted by the work will effect the tripping and hence the vautomaticopening of the die-head. Y

The main object of this invention is toprovide a durable and ruggedself-openingdiehead of the character referred to, constructed withparticular reference to compactness, smoothness and accuracy ofperformance, and its capacity for uninterrupted severe use over longperiods without'suffering derangey ment or other failure.

l/Vith the above and other obgects 1n view as will appear from thefollowing, my in-V vention consists in a self-openingdie-head havingcertain details of construction rand combination ofparts as will behereinafter described and particularly recited in theV claims. Y In theAaccompanying drawings: Fig.

opening die-head constructed inaccordance with my invention;

Fig. 2 is a View thereof in front elevation; Fig. 3 is a centrallongitudinal sectional view thereof, taken on the line 8-3 of Fig. 2,

but on a larger scale7 the parts being shown in the positions due tothem when the chasers are in their cutting'position;

Fig. 4 is a corresponding view, but showing the parts in the positionsdue to them when the latching-mechanism is about to release theChaser-operating member to permitv the retraction of the chasers;

Fig is a correspondinw view,` but showing the parts in the positionsldue to them` F jg. 8 is a similar view taken on the liney l 30 providedwith an axial'bore 31 extending 8*8 of Fig. 6;

1 is a view in side elevation of a self.-k

f Fig. 9' is a corresponding view on the line 9 9 of Fig. 2;

n Fig. 10vis a view in front elevation of the n mounting-memberdetached; y y

Fig. 11 is a side View thereof with the shank broken away;

Fig. 12 is a top 4or planl view thereof with the shank broken away;`

Fig. 13 is a broken longitudinal'sectional` view taken on the line13--13 of Fig. 10;

ing member, detached; i

' Fig. V15 is a view thereof'in rear elevation;`

Fig. 16 isa view infront elevation ofthe latchingrnember detached; and

Fig. 17 is an edge view thereof. y

The particular self-opening die-head herein `chosen for the illustrationof my `invention includes, as shown, a mounting-,member generallydesignated bythe numeral 20 Aand consisting of a rearwardly-projectingshank 2l'by means of which the toolmay bemountedv in the turret 22,indicated by broken lines, of any suitablefthreading-machine. Thevforward portion of the mounting-member 20 constitutes a head y23consisting of an annular flange 24 formed integral with the shank 21 anda separately-formed ring 25 corresponding in ldiameter tothe diameter ofthe flange24 to* which Vitis secured by aVV pair of screws 26T-26. n

The ring 25 just referred to is made sep-arate'from the flange 24 andshank 21 solely for the purpose of convenience in manufac#V ture, butfor lall functional purposes consti,-

tutes an integral element and may beso viewed in the present invention.The ring 25 of the mounting-member 20 is diametrically cut 0r bifurcatedtoprovide a forwardly-facing diametrical couplingA groove 27 (Figs. 10and 12) into and beyond Vi160 Fig. 14 isa lside view ofthechaser'fcarry-` which forwardly extends al guide-sleeveV 28 ,y formedintegrall with the flange 24-and `shank 21, and through which extends,`as well as through thesaid shank, an axi'alborevor pas-A sage 29 toprovide clearance for the work as Y thel same is being threaded. VSlidably mounted upon theV guider-sleeve "28 is a reciprocatingChaser-carrying member A i `completely therethrough and receivingthersaid guide-sleeve 28. The said chaser-carrying member is formed witha rearwardlyextendingcoupling-tang 32 having two iat faces and twoconvex faces, and fitting into the couplingfgroove 27 in the ring 25 ofthe lmounting-member 20, which itclosely fits,

with freedom only for axial vsliding movement. i Y

The Chaser-carrying Imem-ber 30 is. pro- V vided in its forward facewith Yfour(more or f less) radial guide-grooves 33, each receiving aradially-movable chaser 34, which chasers are retained in place againstforward displacement by segmental plates 35 secured to the forward faceof the said chaser-carrying member 30.

The outer ends yof each of the chasers34` are 'rearwardly Y andinwardly-inclined to form cam-surfaces 36,.as shown in Fig. 9, for

Y. engagement with similarly-sloping canifsurfaces 37 formed upon the,forward inner corner of a Chaser-operating sleeve 38 mounted i Vuponthe diej-head structure with capacity for axial sliding movementandbearing'at its forward end upon the periphery of the chaserfcarryin'gmember 30,' and' internally-V threaded at its rearend for the receptionof theforward end of an` adjusting-ring 39, which slides partly upon-theperiphery of rthe ring 25 of the mounting-member 20, as

well as the flangev 23 thereof, and also upon the periphery of therearwardly-extending tang ofthe Chaser-carrying member 30.V

The 'Chaser-operating member 38 and adV jnstingr1ng39 aboverreferred to,1normally function as a junit but are made adjustable withVv respect toVeach 4other for the purpose of permitting van adjustment ofthe cuttingdiameter of the chasers, as will lhereinafter appear.

f', I`he-`- adjusting-ring 39 which, as above polntedV out, is unitarywith the Chaser-oper-` 5' ating sleeve y38, is formed in itsinteriorwith an annular groove 40, the forward wall of Vvwhich forms alocking-shoulder 41 for engagement with the forward upper corner of aradially-movable plate-like locking-member 42 mounted in a transversetangential groove couplingftang 32. of

pair of springs 44-44 housed within complev Amentary pockets,respectively formed in the inner face of the said locking-member and'invthe bottom-wall of thev groove 43, as clearly Y shown in Fig. 6, and islimited in its outward V:movement by a retractable stop-plunger 45having its stem 46'riding ina passage 47 in the Chaser-carrying member30 and project-` ing rearwardly into the groove 43 and into a*Chaser-carrying' member 30.Y

ing-shoulder 41- of the sleeve 38, I provide the said 'locking-member atits respective opposite ends withoperating-ribs 52-52 havingV the notch48 their upper surfaces forwardly and inwardlyA Y inclined as. shown,'and respectively entered into grooves 53-53 formed in the respectiveopposite walls of the groove 27 in the ring 25 before referred to. Therespective upper walls of the'said grooves 53--53 are forward- Y ly`vand inwardly inclined in conformity with the slope of the ribs 52-52 ofthe, lockingmember 42 to provide cam-surfaces 5357-53a engaging the saidribs for the purpose as will hereinafter appear.

The Chaser-'operating sleeve 38 togetherl with the adjusting-ring 39, isurged rearwardly with respect to the Chaser-carrying member 30 by vmeansof a pair of complementary spring-pressed plungers 54-54 (Figs. 6` and 7reciprocatingwithin bores 55-55 in the forwardportion of thechasercarrying member 30 and bearing at their rear ends against theforward end of the adjusting-ring 39. The said plungers 54:-54 arechambered as shown in Fig. 7 and each partially housesa spring 56bearing'at its rear end in the said plunger and at its forward endagainst one 'of the faces ofthe retainingplate 35,'so as to exert aconstant effort to move the adjusting-ring 39 and hence theChaser-operating sleeve 38 rearward Vwith respect to the chaser-carryingmember 30. To

.permit the free play ofthe plungers 54, the

adjacent periphery ofthe ring 25o-f the mounting-member is formed withsemi-circular clearance-grooves 57-57. f

- Similarly, thel Chaser-carrying member 30 is constantlywurgedrearwardly withirespect to the mounting-member 2O` by means of a pair ofcomplementary springs 58-58 respectively encircling screws 59f-59`(Figs.6 and 8) Vscrewed into and rearwardly projecting from theChaser-carrying member 30. Each .of the saidscrews 59 auditscomplementary spring 58 extends within a bore 60 formed in the ring 25on each of the respective opposite sides of `its groove 27 Each, of thesaid springs58 bears at its rear endl against the underside of the headof its complementary screw 59` and at its forward end bears against asliding bushing 61.1' The head of each of 1 the saidrbushings normallybears against an annular stop-shoulder 62 formingafeature of each of thebores 60, while' the forward l. j l endsfof the said bushings bearagainst the notch 48. 1n ythe upper arcuate face of the said. p I;locking-member. The stop-plunger 45 is pro-.v

rear face of the enlargediforward end of the Y and each is urgedforwardly by aspiring 64v the guide-sleeve 38 of themounting-member 2Owith respect to which it may move either forwardly or backwardly fromthe position in which it is shown in Fig. 3.

To provide a ,yieldingv contact when the tool as a whole is advanced ,toengage the chasers 34 with the work, I employ a pair of complementaryplungers 63-63 mounted partially in the rear end of the ring 25 andpartially in the iiange 24 of the mountingmember 20, as shown in Figs.3, 4 and 5. The forward ends of the said plungers engage the rear faceof the Chaser-carrying member 30 and limited inv such forwardmovement bybeing provided with an annular flange 65 engaging a stop-shoulder 66 inthesaid ring 25.

The adjusting-ring 39 owing to its threaded connection before describedwith the Chaser-operating member 38, is rotatable with respect tothelatter for the purpose of adjusting the position of thelocking-shoulder41 and hence regulating the cutting diameter of thechasers 34 and is lockedin any given position of adjustment by a latch67 reciproeating in a bore 68 .formed `in the said chaseroperatingsleeve and urged rearwardly by means of a spring 69 to engage itsrearend with any given oneof an annular series of forwardly-facing pockets70 formed inthe said adj Listing-ring 39. v

For the purpose of moving the chaseroperating sleeve 38 forwardly tomove the chasers into their cutting positions, after the die-head hasbeen tripped, I employ a resetting-finger 71 having a rounded terminal72 projecting within a radial socket 73 `formed in the Chaser-carryingmember 30, and located in a recess 74 formed in a lug 75 offsetting fromand formed integral with the said operating-sleeve 38, as shown in Fig.6.

kThe resetting-finger 71 Vreferred to *is mounted upon a squared portion76 of a resetting-shaft 77 rocking in a bore 7 8 in the lug and formedat its outer end with an integral resettting-arm 79 adapted vto beengaged with any of the customary features of a threading machine forresetting the liehead as will hereinafter appear.

My improved die-head operates in a general way in accordance with thatclass of self-opening die-heads known as the pulloff type. y

With the parts in the positions in which they are shown in Figs. 1 to 3inclusive, the chasers 34 may be engaged with the work or the work withthe chasers. When the desired length of thread has been cut, the feedVof the work with respect to the die-header the feed of the die-headywith respect to theA work, as

the case may be, is stopped, after which the` continued rotation of thevwork will act through thechasers 34v to ldraw" the entireChaser-carrying member 30 forwardly with respect vto the mounting-member`20. The relative forward movement of thechaser-carrying member 30 asjust described, will bodily ycarry with it the locking-member 42together with vthe chaser-'operating sleeve 38 and adjusting-ring 39.

As the locking-member 42 is vbodily moved forward, as above described,its offsettingribs 52 will be caused yto ride down the slope oftheupper` walls 13a-5.3a of the complementary grooves, 53 formed in theopposite walls of the coupling-groove 27 with the effect of graduallymoving the said locking member inward to disengage the same from theannular locking-shoulder 41 in thel ady j usting-ring 39.

The parts will now have assumed the posi-f tions in which they are showninl Fig.-4, at which time the locking-member 42 is shown at the instantit is being cleared fromthe locking-shoulder 41.

Y The instant that the locking-member 42 is fully cleared from theannular locking-shoulder 41 of the adjusting-ring 39, the springs 56-56will act to snap the Chaser-operating sleevel38, together with the saidadjustingring 39, rearward to permit each of the chasers 34to moveradially outward out of engagementV with the work under the urge ofchaser-retracting springs 80 (Fig. 9), oneof which is provided for eachof the said chasers.`

The instant that the chasers `34 move radially outward out of engagementwith the work, as above described, the springs 58-58' will assertthemselves and move the chasercarrying member 30 from `theposition intowhich itlias been pulled by the draft exerted by the work, (Fig. 4)rearward to its normal position of equilibrium with respect to themounting-member 20. The parts will now have assumed the positions inwhich theyare v shownin Fig. 5. l

When itis desired to perform another threading operation a4lrelatively-rearward force exerted upon the resetting-arm 79 will rockthe shaft 77 and hence the resettingfinger 71, with theeffect ofsliding` the chaseroperating sleeve forwardly together with theadjusting-ring 39, which latter will ride over the locking-member 42,Amomentarily depressing the same until the annular lockingshoulder 41 inthe said ring has ridden past the forward edge of the sai dlocking-member,

at which time the latter willsnap outwardly into the groove 40 inposition to engage the f said shoulder 41 and prevent the rearwardmovement ofthe said ring and the sleeve 38- until such time as thedie-head is again l tripped.

The forward sliding Vmovement of the `1 Chaser-operating member 38andthe adjust-- ing-ring 39 will also cause the cani-surfaces 37 at theforwardedge of the said ring to ride I over the cam-surfaces 36 Vuponthey'respective i* chasers 34 and concurrently moveeach of the latterinwardly into position-for cutting a thread; The parts have nowbeen'rest'ored to-the positions in which they are shown in 791may bemanually operated. Y f- Y `VItrwill be appreciated that as athreadingoperation is going on, there will bea strong tendency to rotate thechaser-carrying,member with respect to the mounting-member 42O,v whichtendency is effectively resisted without occasioning cramping by thecoupling-tang 32 engaging with the walls of the coupling-groove 27 inthe ring 25 forming afeature of the mounting-member. Furthermore, bylocating the locking-member 42 in thetang 32 in position to be retractedby inclined surfaces inthe respective opposite walls ofthesaid'coupling-groove 27, I not only provide a convenient and compactar-` rangement of parts but assure the `uniform retraction of thesaidlocling-member and avoid any appreciable cramping action thereupon,so that the die-head remains sensitive to relative forward draftsexerted by the work upon the Chaser-carrying member to effect thetripping of the die-head. f

It will be understood by those skilled in the art that my invention mayassume varied physical forms without departing from my inventiveconceptand I, therefore, do not limit myself to the specific embodimentherein chosen Afor illustration, but only as indicated in the appendedclaims.

" lv claim: i

l. In a pull-off die-head, the combination with a mounting-member formedwith a forwardly-facing diametrical coupling-groove 'provided in each'ofits respective opposite side walls with a`forwardly-and-inwardly-'inclined'shouldergof a Chaser-carrying memberv carried by the saidmounting-member with capacity for relative axial sliding movement withrespect thereto and provided with a 7earwardlyi-eXtending coupling-tangYhaving sliding 'engagement with the'walls of the forwardly-facingdiametrical couplinggroove in the saidmounting-member; chasers mounted1n the saidchaser-carrymg `member a Chaser-operating member operativelyY engaged with the said chasers'fo'r controlling the same and formedwith a locking-y shoulder; and a locking-member mounted in ing member inposition'tolengage the lock- `die-head as yabove .de-

described; or, if desired, the resetting-armr ing-shoulder of thesaid''Chaser-operating f member and Vhaving eachl 'of itsoppositeends.mounting-membe Y 2. A pull-off die-head as set forth in claim l andhaving-the said locking-member bearing at its respective foppositefendsagainst the side-walls of the coupling-groove in the" said'mounting-member vand provided at each of its opposite ends with an`loffsettingrib engaging the inclinedshoulders in thesaidcoupling-groove. Y j j 3. A pull-off die-head as set forth in claim landhaving the, coupling-tang ofthe 'chasercarrying member formedwith twoiiatf faces and two concentric convex-,faces and having a transversenotch formed in one of the saidy convex faces and opening throughthe'complementary iat side-faces to provide a guideway for the saidlocking-Ii'iember.v Y 1 Y 4. In a pull-offdie-headhecombination withamounting-member formed with a for-f` wardljy'f-facing Vdiametricalcoupling-groovek Vprovidedin each of its respective opposite ception ofthe guide-sleeve of the said mounting-member and provided with arearwardly-eXtending coupling-tang also slidingupon' the saidguide-sleeve and having sliding engagement withr'the walls of Vtheforwardlyl facing diametri'cal couplinggroove in th'esaidmount-in(gy-member;v chasers mounted in the said Chaser-carrying member;a chasers-operating member operatively en'gaged' with the said chasers'for controlling they same and formed a locking-shoulder; anda locli-Ving member mounted in the-coupling-tang of the said vChaser-carryingmember 1n position to engage the locking-shoulder of the said'yChaser-operating member and having,

sidewalls with 'a forwardly-and-rearwardly-v each of its opposite endsengaged respective-l lyrvvith the inclined-shoulders in the cou-`pling-groove of the said Vmounting-member. 5. In a pull-off die-head,the combination with the complementary mounting-member andChaser-carrying member' thereof, ,one ofthe-said members beingformedwith a dial metrical coupling-groove .providedl in each of itsrespective opposite side walls with an member operatively lengaged'withlthe .said chasers fori-controlling the same and formed` with alocking-shoulder; anda locking-member mounted yin 4the coupling-tang ofthe c, v12o inclined shoulder, andthe other of the said,

aforesaid complementary member so provided in position to engage thelocking-shoulder of the said Chaser-operating member, and having each ofits opposite ends engaged respectively with the inclined shoulders ,inlhe coupling-groove in the 'other of the said complementary members.

In testimony whereof, I have signed this specification. i

ROYCE M. STRICKLAND.

